I wired one of these into the cargo area ceiling. It’s connected to the boot light in the lower right corner so it activates just like any other dome light.
If you look, you may even find it in almond to almost the D1 interior. Just search for dome light (RV, etc) on Amazon and they’ll pop up.
As for the rear work light, that was my first “improvement.” It was a little caveman-ish, but it’s worked for 8 years. I made a bracket to mount above the rear washer jet. At the time, the jet wasn’t working, so I drilled a bigger through the jet for my wire and connected it to the trailer wiring harness fog lights. Wire it into the fog light button on the dash, and you’re on.
There’s a writeup somewhere for using the trailer harness, and if you wire it so it’s always hot, you can have light in the back. I have it set to work with my rear fogs and a kill switch inside the back door so I can have the fogs on and no work light for traveling. This setup is also nice if you want red light outside at night and don’t need the bright work light.
I can post a picture of the lamp setup tomorrow, but I’m sure it’s been done before. Nothing new here for a 25 year old truck!